Stator for a high efficiency motor and manufacturing methods thereof

1. A manufacturing method of a stator for a high efficiency motor, the method comprising:

preparing a filling powder by coating a surface of a soft magnetic powder with an insulating layer;

providing a stator core partitioned into a center hole and inner spaces, the stator core including a yoke portion and a plurality of teeth;

coiling coils around the plurality of teeth located in the inner spaces, respectively;

filling the inner spaces with a mixture of the filling powder and an adhesive; and

curing the mixture of the filling powder and the adhesive,

wherein the preparing of the filling powder includes

mixing the soft magnetic powder, an insulation powder, and a reaction accelerator together, therein providing a first mixture powder,

milling the first mixture powder so that the insulation powder adheres to the surface of the soft magnetic powder, therein providing a second mixture powder, and

heat-treating the second mixture powder so that the insulating layer is formed on the surface of the soft magnetic powder, therein providing the filling powder.

2. The method of claim 1 , wherein the insulation powder is alumina powder, and

wherein the reaction accelerator is ammonium chloride powder.

3. The method of claim 2 , wherein the first mixture powder is prepared by mixing the soft magnetic powder, the alumina powder, and the ammonium chloride powder at a mass ratio of 60-90:9-39:1, respectively.

4. The method of claim 3 , wherein the second mixture powder is heat-treated at a temperature of 750-1300° C. for 10-24 hours.

5. The method of claim 4 , further comprising:

forming core covers by applying the mixture to upper and lower surfaces of the stator core filled with the mixture, and by curing the mixture after the filling of the inner spaces.

6. The method of claim 2 , wherein the second mixture powder is heat-treated at a temperature of 750-1300° C. for 10-24 hours.

7. The method of claim 1 , wherein the second mixture powder is heat-treated at a temperature of 750-1300° C. for 10-24 hours.

8. The method of claim 1 , further comprising:

forming core covers by applying the mixture to upper and lower surfaces of the stator core filled with the mixture, and by curing the mixture after the filling of the inner spaces.

9. The method of claim 1 , the stator core is provided in such a way that a plurality of split cores having respective back yokes and teeth is radially disposed to form the center hole and the inner spaces.